Abstract:Industrial test was carried out in 8m3 oxygen blast furnace. Hearth and furnace shaft are respectively developed a row of tuyeres. oxygen and powder coal were injected into the hearth tuyeres, and preheating coke oven gas was injected into the furnace shaft. The test results showed that the oxygen blast furnace is feasible to inject oxygen and large coal, coal ratio can reach to 450kg, and production efficiency can be greatly improved. When injection 180Nm3/tFe preheated coke oven gas to the furnace shaft, coke ratio decreased 90kg, coal ratio reduced 50kg, productivity increased by 20%. If the oxygen blast furnace is produced in a commercial scale and top gas is recycled, it can significantly reduce fuel consumption and save cost.